Resilient mounting for vibratory bodies



Oct. 7, 1941. J. F. FRESE I RESILIENT MOUNTING FOR VIBRATORY BODIES Filed July 6', 1940 INVENTOR F. Fr E 5 E Joseph Patented Oct. 7, 1941 :RESILIENT MOUNTING FOR VIBRATORY BODIES Joseph F. Frese, Baltimore, Md., assignor to Monitor Controller Company, Baltimore, Md., a corporation 01? Maryland Application July 6, 1940, Serial No. 344,289

1 Claim.

This invention relates to means for mounting the magnets of electromagnetically operated switches upon switch boards or panels in such manner that the vibration of the magnet from any cause will not be mechanically transmitted to the board or panel. Where a magnet adapted for use in an alternating circuit is used to operate the switch, if the magnet is secured rigidly to a metal panel, the vibrations of the magnet resulting from the use of such current causes a humming sound in the panel which is objectionable. The purpose of the present invention is mainly to provide a simple supporting means between the magnet and the panel which will prevent the transmission of these vibrations to the panel.

In the accompanying drawing which illustrates the invention Figure l is a front elevation of an electromagnetically operated switch embodying my improvements;

Figure 2 is a side view of the same, showing the magnet connected to a vertical panel;

Figure 3 is a. section of the line 3--3 of Figure 1, showing the magnet and the supporting brackets in top plan View;

Figure 4 is a section on the line l--4 of Figure 3;

Figure 5 is a side view of one of the rubber strips which flt between and interlock with the metal bracket members;

Figure 6 is an edgeview of the strip shown in Figure 5;

Figure 7 is a perspective view of one of the bracket members which attaches to the magnet, and

Figure 8 is a similar view of one of the bracket members which attaches to the panel.

Referring to the drawing, A indicated a switch mechanism suitably supported upon a solenoid a of the type shown in my Patent Number 2,097,403, dated October 26, 1937, adapted for use on alternating current circuits, the solenoid comprising a laminated iron body I, clamped between face plates 2 of non-magnetizable metal by machine screws 3 and 4, an energizing coil a and an armature 5 which is movable upwardly when the magnet is energized. A cross-bar B of insulating material, suitably connected to the armature, carries contacts 1 adapted to engage stationary contacts 8. As the switch structure forms no part of the present invention it need not be described in detail.

The invention relates to the means for supporting the magnet upon the panel B. In carrying out the invention I secure to the rear side of the magnet body I two rearwardly projecting metal bracket plates 0, spaced apart and parallel with one another, one of these plates being shown in Figure 7. It comprises a flat, oblong, body portion 0 having a series of transverse slots 0 evenly spaced apart, and a flange c which projects from one of its longitudinal edges at a right angle to the body. This flange has threaded openings 0 Each plate 0 is secured to the back of the magnet, with its body portion extending rearwardly therefrom in a vertical plane by an upper screw 3 and a lower screw 4, these screws extending into the openings 0 in the flange oi the plate.

Bracket plates 6, one of which is shown in perspective in Figure 8, are adapted for connection to the panel B. Each of these plates has a flat body portion 2 in all respects the same as the body portion 0 of a plate 0, the series of transverse slots e being adapted to register with the corresponding slots 0 in a plate 0 when the plates are placed side by side as shown in Figures 3 and 4. Each plate 6 has a right angled flange e by which it may be secured to the panel board B, by means of screws 9.

A flat strip of rubber d, shown in Figures 5 and 6, of the same length and approximately the same Width as the bodies of the bracket plates, has transverse ribs (1 projecting from its opposite sides, these ribs corresponding in number and location to the slots in the bracket plates.

In mounting the magnet on a panel board, the bracket plates 0 having been secured to the magnet, a rubber strip d is placed against the inner side of each plate 0 with the ribs d extending through the slots in the plate. The bracket plates e are then brought into the position shown in Figures 3 and 4:, with the bodies of the plates lying against the inner sides of the rubber strips and the ribs (1 of the strips projecting through the slots in the plates, and the plates are secured to the panel by screws 9 which extend through openings in the flanges e.

The plates of each bracket fit firmly against the opposite sides of the rubber strip, and the weight of the magnet is carried by the rubber ribs which extend through the slots in the plates. Thus, there is no rigid mechanical connection between the magnet and the panel, but only a connection of resilient rubber which prevents transmission of the vibrations of the magnet to the panel. Such vibrations transmitted to a sheet metal panel produce an objectionable humming noise in the panel, but this is entirely overcome by mounting the magnet in the manner here shown and described. Also, it is to be noted that the two metal parts of each bracket are electrically insulated from one another and that the rubber interlocks with both of said parts so that these several parts of each bracket can be easily assembled by simply placing the rubber strip in position and fastening one bracket part to the panel.

While I have described the application of the invention to a particular purpose, that of supporting an electromagnet on a panel to eliminate the transmission of vibrations from the former to the latter and also to electrically insulate them, the invention may be used to support bodies other than magnets by providing plates or flanges fixed to the body and projecting at the same side thereof and plates attachable to a suitable support, each adapted to lie parallel with a plate attached to the body, each pair of plates having registering openings, and a rubber strip between each pair of plates having projections on it opposite sides adapted to fit into the openings in both plates.

What I claim is:

Means for securing a body to a supporting member comprising two brackets resiliently connecting said body to said member so as to be supported thereby and insulated and spaced therefrom, each bracket comprising two parallel upright plates, one secured to the body and the other secured to said member, each plate having a series of transverse slots, and a strip of rubber clamped between said plates and having ribs on its opposite sides projecting into the slots in the plates.

JOSEPH F. FRESE. 

